Jose Mourinho has returned to Chelsea, and their Premier League rivals should watch out.
Manchester United have lost Sir Alex Ferguson and Manchester City face uncertainty over their new manager.
Mourinho knows how to win the Premier League and will believe the side he has inherited can do so again.
Here we look at a few key factors that would send a shiver down both Manchester clubs and the rest of the Premier League's spine at the return of the 'Special One'.
A new era of leadership
Okay so the change of manager at Manchester City isn't anything new, but, the big talking point towards to tail end of the season was the stepping down of a Premier League stalwart in Sir Alex Ferguson.
This is the first time the Premier League will be without Sir Alex and this can only benefit Chelsea and Mourinho. No mind games and no 'Fergie Time.'
I would say the percentage of Chelsea fans who were happy with the appointment of Rafael Benitez were in single figures - for Mourinho that is the polar opposite. The man that took Chelsea to there first League title in fifty years and their first League and Cup double will undoubtedly get the fans drooling over more success and this time, they hope, the dominance won't be as short lived.
The dressing room at Stamford Bridge has become somewhat of a dragons lair guarded by the old heads that reside within. Andre Villas-Boas couldn't work in that environment and there was some speculation Benitez had some of the same issues.
Mourinho commands respect, he's won everywhere he's been and the 'troubles' with players that other managers faced would almost certainly cease. Players that had played under him before know what to expect, and the new guys have heard all the folklore that surrounds the 'Special One'.
As mentioned earlier the name Mourinho commands respect, from players to other members of coaching staff. His name, just like Sir Alex's, is more than enough to entice world class players to come to Chelsea, that and the huge financial incentives he'd be able to offer. Something which David Moyes at Manchester United may struggle with.
Getting the most out of his players
Didier Drogba, household name now but when he arrived at Stamford Bridge he wasn't. £24million for a relative unknown, Mourinho saw potential and look at the results! Slow to begin with but once he settled into the Mourinho philosophy he was unplayable.
This time Mourinho enters Stamford Bridge with a ready replacement, in Romelu Lukaku, at great season at West Bromwich Albion has catapulted him into the frame to be Chelsea's number nine. You wouldn't bet against Mourinho waving his magic wand and turning Lukaku from a great Premier League player to a world class player.
Whether or not the second coming of Mourinho is a success or whether he does what Graham Taylor did to Aston Villa at the second time of asking remains to be seen.
One thing for sure the arrival of Mourinho back at Chelsea only heightens the profile of both the Premier League and Chelsea.
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